Head position control method and disk storage device
a technology of disk storage and position control, which is applied in the direction of maintaining head carrier alignment, recording information storage, instruments, etc., can solve the problems of large differential in eccentricity between disks, invariably occurring eccentricities, and different amounts of such deviations, so as to shorten the seek time
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first embodiment
Next, the correction trajectory generating section 60 shown in FIG. 7 is described, with reference to FIG. 8. This correction trajectory generating section 60 determines the initial velocity V0 and current step U1 from the eccentricity correction current. Thereupon, the section 60 generates a position correction trajectory and current correction trajectory by multiplying by a normalized correction trajectory which reduces this initial velocity and current differential to zero.
The section generating the difference between the eccentricity correction currents of the two heads is constituted by the eccentricity correction current table 46 and the current differential calculating section 48 which calculates the differential between the eccentricity correction currents of the two heads, before and after switching, similarly to FIG. 5 and FIG. 6.
As stated previously, eccentricity can be represented by a sinusoidal wave, and the eccentricity correction currents can also be taken as respect...
second embodiment
FIG. 9 illustrates a correction trajectory generating section 60 in FIG. 7. This correction trajectory generating section 60 determines the initial velocity V0 from the eccentricity correction current and multiplies this initial velocity by a correction trajectory which reduces the velocity to zero, thereby generating a position correction trajectory and a current correction trajectory corresponding to the magnitude of the initial velocity.
The section generating the difference between the eccentricity correction currents of the two heads is constituted by the eccentricity correction current table 46 and the current differential calculating section 48 which calculates the differential between the eccentricity correction currents of the two heads, before and after switching, similarly to FIG. 5 and FIG. 6.
As stated previously, eccentricity can be represented by a sinusoidal wave, and the eccentricity correction currents can also be taken as respective sinusoidal waves. This sinusoidal...
third embodiment
Next, the correction trajectory generating section 60 shown in FIG. 7 is described with reference to FIG. 10. This correction trajectory generating section 60 determines the current differential U1 from the eccentricity correction current. Thereupon, it multiplies the current differential U1 by a correction trajectory which reduces the initial differential to zero, and hence generates a position correction trajectory and a current correction trajectory.
The section generating the difference between the eccentricity correction currents of the two heads is constituted by the eccentricity correction current table 46 and the current differential calculating section 48 which calculates the differential between the eccentricity correction currents of the two heads, before and after switching, similarly to FIG. 5 and FIG. 6.
As stated previously, eccentricity can be represented by a sinusoidal wave, and the eccentricity correction currents can also be taken as respective sinusoidal waves. Th...
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Abstract
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